Remember, an FPR closes to increase fuel pressure (think of water flowing in a hose, you cap the end of the hose, the water pressure in the hose increases).

The FPR's job is to increase or decrease the fuel pressure in the rail in relation to atmospheric pressure, up to the point where boost is made. After that, most FPR's increase fuel pressure in a 1:1 ratio, or 1 PSI fuel pressure increase for 1 PSI boost increase.

An FMU takes over where the FPR leaves off, by increasing the fuel pressure in greater ratio's per PSI of boost. So a 5:1 FMU increases the fuel pressure 5 PSI for every 1 PSI of boost.

Ok, I wanted to know where will the Fuel Management Unit vacuum line hook up to ? If I installed Fuel Management Unit then where will I hook up vacuum line to ? Fuel Management Unit to Throttle Body ? or Fuel Management Unit to Fuel Regulator ? That I want to know. Let me know. Thanks

And 1 more thing that I wanna ask. I wanted to know will that be fine if I run my Supercharger with 2.7 pulley thats about 5 to 7 psi of boost and I put in Fuel Management Unit 8:1 will that be good enough for my car ? Let me know. Thanks